Muralidhara, R S and Kesavulu, C R and Rao, J L and Anavekar, R V and Chakradhar, R P S (2010) EPR and optical absorption studies of Fe(3+) ions in sodium borophosphate glasses. Journal of Physics and Chemistry of Solids, 71 (12). pp. 1651-1655. ISSN 0022-3697

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Abstract

Electron paramagnetic resonance (EPR) and optical absorption spectral investigations have been carried out on Fe(3+) ions doped sodium borophosphate glasses (NaH(2)PO(4)-B(2)O(3)-Fe(2)O(3)) The EPR spectra exhibit resonance signals with effective g values at g = 2 02 g = 4 2 and g = 6 4 The resonance signal at g = 4 2 is due to isolated Fe(3+) ions in site with rhombic symmetry whereas the g = 2 02 resonance is due to Fe(3+). ions coupled by exchange interaction in a distorted octahedral environment The EPR spectra at different temperatures (123-295 K) have also been studied The intensity of the resonance signals decreases with increase in temperature whereas linewidth is found to be Independent of temperature The paramagnetic susceptibility (x) was calculated from the EPR data at various temperatures and the Curie constant (C) and paramagnetic Curie temperature (0(p)) have been evaluated from the 1/f versus T graph The optical absorption spectrum exhibits bands characteristic of Fe(3+) ions in octahedral symmetry The crystal field parameter (Dq) and the Racah interelectronic repulsion parameters (B and C) have also been evaluated and discussed (C) 2010 Elsevier Ltd All rights reserved

Item Type:	Article
Uncontrolled Keywords:	Amorphous materials; Glasses; Chemical synthesis; Electron paramagnetic resonance (EPR); Optical properties
Subjects:	Glass
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	14 Feb 2012 12:40
Last Modified:	14 Feb 2012 12:40
URI:	http://cgcri.csircentral.net/id/eprint/821

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